Find zw or 
as specified. Leave your answer in polar form.z = 1 + iw = 
- iFind zw.
A. 
(cos 15° + i sin 15°)
B. 2
(cos 75° + i sin 75°)
C. 2
(cos 15° + i sin 15°)
D. 2
(cos 345° + i sin 345°)
Answer: C
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Express the number in scientific notation.216
A. 2.16 x 102 B. 2.16 x 10-2 C. 2.16 x 101 D. 2.16 x 103
Solve the problem.Suppose you invest $P on a CD paying 2.75% interest compounded continuously for a term of four years. At the end of the term you get $2232.56 from the bank. Find the value of the original principal P. Round your answer to the nearest dollar.
A. $2015 B. $1975 C. $2000 D. $1995 E. $2025
Without using a calculator, determine the value of the trigonometric function or state that the value is undefined.tan 
A. -1 B. undefined C. 0 D. 1
Solve the problem.A chemist needs 130 milliliters of a 49% solution but has only 24% and 89% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 83 ml of 24%; 47 ml of 89% B. 47 ml of 24%; 83 ml of 89% C. 50 ml of 24%; 80 ml of 89% D. 80 ml of 24%; 50 ml of 89%